Create langchain tool dynamically

[Voileexperiments]

Checked

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Feature request

Provide a method to create langchain tool dynamically through data structure, other than staticly defining tools in code.

Motivation

Currently I'm using langchain to interface with an existing system which has different kinds of business objects. I'd like to make user ask the LLM to perform AI-powered search (e.g "search for all {object A} in {folder B} today where {field C} equals {value D}") on these business objects, by LLM generating a query for searching.

However, users can freely define business objects and configure fields in every logic. They are completely dynamic, so we cannot decide the search schema ahead in time, nor is it feasible to pass all business object schema into the LLM.

User might also ask about other things, so it is infeasible to strictly limit LLM to generate query.

I want to use tools to achieve this. Currently I enforce the business object limit by defining in advance which business objects are eligible for LLM to generate a search query for, then turn them into a tool for each business object. However, langchain only provides constructs that define static tools. There are no APIs to define tools on the fly and make use of them for the specific LLM request.

Please note that I DO NOT want to bind raw json directly to model, since I still want to use InjectedToolArg and existing langchain tool constructs.

I use langchain Python.

Proposal (If applicable)

No response

[feijoes]

Langchain.js already has a DynamicTool that might help in implementing this feature.